It is not uncommon for developers to get acquired even at lower than market value just so they can focus on making games & serving customers instead of worrying about payroll, healthcare, partner relations, vendors. Yes its a huge hassle.
I know it often (ok usually) ends badly as bigger companies have surprisingly little idea how to manage acquired creative teams. That said it sometimes works, I am happy for Brian Fargo. I hope it works out for him and the team there.